There was an unexpected knock on my door, and like I always do I first opened the peephole and asked, "Who's there?"

"Parcel post, ma'am. I have a package that needs a signature."

"Where's the package?" I asked suspiciously. The deliveryman held it up.

"Could I see some ID?" I said, still not convinced.

"Lady," he replied wearily, "if I wanted to break into your house, I'd probably just use these." And he pulled out the keys I had left in the door.